Dresden 2006 – wissenschaftliches Programm
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MM: Metall- und Materialphysik
MM 3: Symposium Modern Metallic Materials Design I
MM 3.3: Vortrag
Montag, 27. März 2006, 10:45–11:00, IFW B
Atomic Structure Determination of Phason Planes in the ξ’-Al-Pd-Mn Phase — •H. Tian1, W. Sun2, and Z. Zhang2 — 1Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100080, China — 2Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, 100 Pingle Yuan, Chao Yang District, Beijing 100022, China
The atomic structures of specific types of linear defects (phason lines) [1] and planar defects (phason planes) [2,3] in the complex metallic alloy phase ξ’-Al-Pd-Mn were determined by means of high-resolution electron microscopy (HREM) and theoretical HREM simulation. The results show that a representational atomic structural model for phason planes can be constructed by introducing a shift between two parts of the perfect crystalline structure using a translation vector of r=1/2 α+1/2τ χ. This typical phason plane is normally parallel to the (001) plane of the ξ’-Al-Pd-Mn phase and consists of phason lines which are arranged side-by-side with their linear direction parallel to the [010] axis. HREM simulations based on the structural model for both edge-on and inclined types of phason lines agree well with the experimental results. Taking into account the fact that the structural difference between various curved phason planes is due to the variation in the arrangement of individual phason lines, the atomic structures of the edge-on and inclined phason lines can be used to explain the various curved and broaden phason planes frequently observed in the ξ’-Al-Pd-Mn phase.
[1] H. Klein, M. Feuerbacher, P. Schall, K. Urban, Phys. Rev. Lett. 82 (1999) 3468. [2] H. Klein, M. Feuerbacher, P. Schall, K. Urban, Phys. Rev. Lett. 82 (1999) 3468. [3] H. Klein, M. Feuerbacher, K. Urban, Mat. Sci. Eng. 294 (2000) 769.